The cost of mailing a first class letter is $0.46 for the first ounce and $0.20 for each additional ounce or portion of an ounce. Y is the total cost for mailing a lettter that weights x ounces. Which

The cost of mailing a first class letter is $0.46 for the first ounce and $0.20 for each additional ounce or portion of an ounce. Y is the total cost for mailing a lettter that weights x ounces. Which type of function model would be appropriate for this situation? A. Step fiction B. Linear function C. Square root function D. Absolute value function